Final answer:
An 18-gauge hypodermic needle is larger in diameter than a 30-gauge needle, making the statement false.
Step-by-step explanation:
The statement that a 30-gauge hypodermic needle is larger in diameter than an 18-gauge needle is false. The gauge of a needle represents the needle's diameter; however, the relationship is inversely proportional, meaning that a higher gauge number indicates a smaller needle. In this case, an 18-gauge needle has a larger diameter than a 30-gauge needle.